docs: def lookups(self, request, model_admin):
          """
          Returns a list of tuples. The first element in each
          tuple is the coded value for the option that will
          appear in the URL query. The second element is the
          human-readable name for the option that will appear
          in the right sidebar.
          """
  
          types = models.EventType.objects.filter(is_public=True).order_by('slug')
  
          types = [(t.id, t.swatch()) for t in types]
  
          return types